diff --git a/cylc/flow/etc/examples/hello-world/.validate b/cylc/flow/etc/examples/1-hello-world/.validate
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rename from cylc/flow/etc/examples/hello-world/.validate
rename to cylc/flow/etc/examples/1-hello-world/.validate
diff --git a/cylc/flow/etc/examples/hello-world/flow.cylc b/cylc/flow/etc/examples/1-hello-world/flow.cylc
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rename from cylc/flow/etc/examples/hello-world/flow.cylc
rename to cylc/flow/etc/examples/1-hello-world/flow.cylc
diff --git a/cylc/flow/etc/examples/hello-world/index.rst b/cylc/flow/etc/examples/1-hello-world/index.rst
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rename from cylc/flow/etc/examples/hello-world/index.rst
rename to cylc/flow/etc/examples/1-hello-world/index.rst
diff --git a/cylc/flow/etc/examples/integer-cycling/.validate b/cylc/flow/etc/examples/2-integer-cycling/.validate
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rename from cylc/flow/etc/examples/integer-cycling/.validate
rename to cylc/flow/etc/examples/2-integer-cycling/.validate
diff --git a/cylc/flow/etc/examples/integer-cycling/flow.cylc b/cylc/flow/etc/examples/2-integer-cycling/flow.cylc
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rename from cylc/flow/etc/examples/integer-cycling/flow.cylc
rename to cylc/flow/etc/examples/2-integer-cycling/flow.cylc
diff --git a/cylc/flow/etc/examples/integer-cycling/index.rst b/cylc/flow/etc/examples/2-integer-cycling/index.rst
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rename from cylc/flow/etc/examples/integer-cycling/index.rst
rename to cylc/flow/etc/examples/2-integer-cycling/index.rst
diff --git a/cylc/flow/etc/examples/datetime-cycling/.validate b/cylc/flow/etc/examples/3-datetime-cycling/.validate
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rename from cylc/flow/etc/examples/datetime-cycling/.validate
rename to cylc/flow/etc/examples/3-datetime-cycling/.validate
diff --git a/cylc/flow/etc/examples/datetime-cycling/flow.cylc b/cylc/flow/etc/examples/3-datetime-cycling/flow.cylc
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rename from cylc/flow/etc/examples/datetime-cycling/flow.cylc
rename to cylc/flow/etc/examples/3-datetime-cycling/flow.cylc
diff --git a/cylc/flow/etc/examples/datetime-cycling/index.rst b/cylc/flow/etc/examples/3-datetime-cycling/index.rst
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rename from cylc/flow/etc/examples/datetime-cycling/index.rst
rename to cylc/flow/etc/examples/3-datetime-cycling/index.rst